Question

Which is the most important factor in regulation of transpiration?

• A. Light
• B. Temperature
• C. Humidity
• D. Wind

Answer 1

The correct option is C Humidity

Transpiration is the evaporative loss of water from the leaves of plants. This process is controlled by the opening and closing of stomata. The factors affecting transpiration include – atmospheric humidity, temperature, light, wind velocity, soil water content, atmospheric pressure, carbon dioxide concentration. Out of these factors, the amount of moisture in the atmosphere or the humidity is the major determining factor of the rate of transpiration.

So, the correct answer is 'Humidity'.